diff options
Diffstat (limited to 'sound/core/seq/seq_system.c')
| -rw-r--r-- | sound/core/seq/seq_system.c | 56 |
1 files changed, 32 insertions, 24 deletions
diff --git a/sound/core/seq/seq_system.c b/sound/core/seq/seq_system.c index 0dc5d5a45ecc..5b5603e5970b 100644 --- a/sound/core/seq/seq_system.c +++ b/sound/core/seq/seq_system.c @@ -1,22 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * ALSA sequencer System services Client * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl> - * - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * */ #include <linux/init.h> @@ -64,12 +49,14 @@ static int sysclient = -1; /* port id numbers for this client */ static int announce_port = -1; +/* number of subscriptions to announce port */ +static int announce_subscribed; /* fill standard header data, source port & channel are filled in */ static int setheader(struct snd_seq_event * ev, int client, int port) { - if (announce_port < 0) + if (announce_port < 0 || !announce_subscribed) return -ENODEV; memset(ev, 0, sizeof(struct snd_seq_event)); @@ -91,25 +78,27 @@ static int setheader(struct snd_seq_event * ev, int client, int port) /* entry points for broadcasting system events */ -void snd_seq_system_broadcast(int client, int port, int type) +void snd_seq_system_broadcast(int client, int port, int type, bool atomic) { struct snd_seq_event ev; if (setheader(&ev, client, port) < 0) return; ev.type = type; - snd_seq_kernel_client_dispatch(sysclient, &ev, 0, 0); + snd_seq_kernel_client_dispatch(sysclient, &ev, atomic, 0); } +EXPORT_SYMBOL_GPL(snd_seq_system_broadcast); /* entry points for broadcasting system events */ -int snd_seq_system_notify(int client, int port, struct snd_seq_event *ev) +int snd_seq_system_notify(int client, int port, struct snd_seq_event *ev, + bool atomic) { ev->flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; ev->source.client = sysclient; ev->source.port = announce_port; ev->dest.client = client; ev->dest.port = port; - return snd_seq_kernel_client_dispatch(sysclient, ev, 0, 0); + return snd_seq_kernel_client_dispatch(sysclient, ev, atomic, 0); } /* call-back handler for timer events */ @@ -118,6 +107,22 @@ static int event_input_timer(struct snd_seq_event * ev, int direct, void *privat return snd_seq_control_queue(ev, atomic, hop); } +static int sys_announce_subscribe(void *private_data, + struct snd_seq_port_subscribe *info) +{ + announce_subscribed++; + return 0; +} + +static int sys_announce_unsubscribe(void *private_data, + struct snd_seq_port_subscribe *info) +{ + if (snd_BUG_ON(!announce_subscribed)) + return 0; + announce_subscribed--; + return 0; +} + /* register our internal client */ int __init snd_seq_system_client_init(void) { @@ -141,7 +146,7 @@ int __init snd_seq_system_client_init(void) } /* register timer */ - strcpy(port->name, "Timer"); + strscpy(port->name, "Timer"); port->capability = SNDRV_SEQ_PORT_CAP_WRITE; /* accept queue control */ port->capability |= SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ; /* for broadcast */ port->kernel = &pcallbacks; @@ -155,9 +160,12 @@ int __init snd_seq_system_client_init(void) goto error_port; /* register announcement port */ - strcpy(port->name, "Announce"); + strscpy(port->name, "Announce"); port->capability = SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ; /* for broadcast only */ - port->kernel = NULL; + pcallbacks.event_input = NULL; + pcallbacks.subscribe = sys_announce_subscribe; + pcallbacks.unsubscribe = sys_announce_unsubscribe; + port->kernel = &pcallbacks; port->type = 0; port->flags = SNDRV_SEQ_PORT_FLG_GIVEN_PORT; port->addr.client = sysclient; |